Laboratory apparatus



Oct. 23, 192s. R. STARK LABORATORY APPARATUS Filed April 2s, 1927 the corresponding lever and is pivoted to it l vlar staff having a lengthwiseslot, a cross bar` 1 on theupper end of the staff, a. pair of levers Patented oci. 23, 192e,v

'UNITED sixaflias.YA

RUDI STARILOF Caucaso, ILLINOIs, AssIGNOR'TO OENTRALSOIENTIFIO OOMPANY; or CHICAGO, ILLINOIS, vA CORPORATION OF ILLnvOIs.

LABORATORY APPARATUS.

f Applicationl filed April 29,

'Ihis invention relates to laboratory-apparatus and has for its principal object topro-A vide means for holding lenses of assorted sizes, gripping hot objects such as'beakers, and for a variety of lother similar uses in the laboratory. n

A very satisfactory embodiment of .the invention is illustrated in the accompanying drawings, in which 'Y Fig. 1 is a side elevation with the parts shown in one position in solid lines and yin another position in broken lines, and

- Fig. 2 is a longitudinal central section of Fig. 1 taken at right anglesfto the plane of the paper. v Y

This specificillustration, however, and the correspondingly speci'ic description, are used to make the disclosure clear and are not to be construed as' limiting the claims to this particular structure.

' The -base of the device is a hollow staif '10 which may be mounted on a lsuitable support, or used as a handle, as occasion makes desirable. At the upper end of the staff there is fixed a cross bar 11,'extending equal distancesY on each side of the staff. A'lever 12V (in this instance shown as an L-shaped member) is fulcrumed at each end of the cross bar on a pin 13. Applied to the free end of each lever is a strip of metal 14 bent across ,thel back edge and along thev two sides of the 'lever and the free ends of the strip are spread apart to form diverging gripping fingers 15, as best seen in Fig. 2. The levers are connected above the cross bar by a toggle composed of two links 16. The outer end of each link is split to receive by a pin 17. .The inner end offeach link is forked and one branch 18 of each fork is offset somewhat more than the other branch 19, in order that the branches may be brought into the overlapping relationillustrated in Fig. 2, and pivotally connectedby the pin 2O to form a kneefjoint in alignment with'the staff 10. The branches 19 are spaced apart a suiiicient'distance to receive the upperend of a rod 21, which is pivoted to the links by pin 20 and projects above the toggle where to ingers 15 on the levers 12.

it is provided with fingers 22 corresponding Rod 21 is slidably mounted in the staff 10 and a spring 23 compressed between thev inner end of the rod 21 and a plug 24 in the bottom of the sta urges the rod upwardly.A A pin 1927. yseriai No. 187,580.

25 fixed to the inner end ofthe rod projects through a slot v26 in the wall ofthe stuft and is provided with aknob 27- which forms a thumb piecey by Vwhich the' rod may be re;- tractedagainst the resistance of the spring.`

The lpin 20which formsthe pivot ofthe knee joint is alsoprovidedwith aknob 28 for the same purpose. 7 The spring23 urging'the rod upwardly in vthe drawing bends the toggle and swings thel levers inwardly. Retracting the rod strai glitvens the toggle .and swings the levers 'ontwardly.. As aresult, the three gripping devices, or fingers,.move simultaneously to grip or to release obJects such as lenses indicated lmsmK4 OFFICE'. p

by 29 and 30 iii-Fig. 1. This simultaneous I movement also has the advantage, when the' device is used for aholder-for lensesofassorted sizes, in that without moving the stali theaxis of eachlens, regardless of its size, coincides with a fixed line. VIn other words,

the gripping devices move simultaneousl7 vtoward and away from a fixed axis vat right kangles to the paper in Fig. 1. f

The levers 12 in this embodiment are bent to form short armsV yfulc'rumed on the' cross bar and long arms carrying the gripping def 1 vices, and the toggle is connected to the levers at the bends. This makes it lpossible to use fa relatively short cross lbar 11 and'makes the device compact and small as compared with 1. In a device of the classdes'cribed, a tubufulcrumed to'the cross bar on opposite sides of the staff, a gripping finger carried by each lever, atoggle connecting the levers above the f' cross bar and having a'vknee joint aligned with the staff, a third gripping finger carried by the toggle, a rod slidabley in the staff and connected with the toggle, a spring-urging 'the rod fout of the staff, andan operating pin for the rod projecting through the slot in the staff.

2. In a device of' the class described, a tubular staff, a cross bar on the upper end of the staff, a pair of levers fulcrume'd to the cross bar on opposite sides of the staff, a gri]: ping finger carried vby each lever, aptoggle connectlUO llU 1 ing the levers above the cross bar and having alrnee joint aligned With the stall, a third gripping. linger carmried by the toggle2 a rod slidable in tlie stali and connected with the toggle7 and a spring urging the rod ont Vol" the stall. Y

f 3. in a deviceof the class described, three gripping lingers movable simultaneously tev grip or release an object, a pivoted lever lioi' each ol two olthe toggle for the third finger controlling the pivoteddevers7 and yielding means controlling the toggle.

grip or release an object, a stall, a leverlor eachof twongerslnlcruined on the stall, a toggle connecting the levers and having a knee joint aligned with the stall and carrying the third linger and resilient means urging the lingers together.

6. In a device oi the class described, a liol'- i 10W stall, a rod mounted to reciprocate in the stad, a springurging the rod infone direc'- tierna pair of 4togglelinlrs pivoted .toV the rod to form a lrneejoint', a pair of levers lul'- leinmed on the stallI to swing toward and away from each other, and pivotally,connected with the opposite ends ofthe toggle, a gripping linger on the rody adiacent to the knee joint,

vand agripping linger mounted in corresponding ends pivoted to the leversebetween; the Y liilcra and the lingers, a grippinglinger carri ried by the toggle at the knee yoint and means lto bend-the toggle and thereby move the 5. In a device of the class deseribed,"three` gripping lingers niovable simultaneously' to lingers iniinison. y

8. In a device olf the class described, astall,

across-bar carried by the stall, a pair'ol gripy I ping members pivoted to the cross-bar', a slidable i'ed carried by the stad and constituting a third gripping member, and gripping lingers carried by each of the said'gripping members, said lingers being maintained always equidistant from a fixed axis. ln testimony Whereol l aliiir my signature.

anni sTAnK. K 

